Linear motor force over the speaker's operational excursion range|Consistent motor force with both positive and negative current through the coil|Consistent motor force at varying applied power levels |injection-molded mica-filled polypropylene cone bodies with synthetic rubber surrounds specifically formulated with UV inhibitors for marine duty.|Marine-grade synthetic fiber spiders with progressive roll designs to withstand high humidity.|Specifically engineered polymer baskets are corrosion and UV-resistant and encapsulate the woofer's motor system to prevent corrosion.|Gold-plated marine-grade brass connection terminals|Marine-grade stainless steel mounting hardware is included.|Subwoofers: W7 W6v3 TW5v2 TW3 TW1 W3v3 |Enclosed Car Subwoofers: Stealthbox PowerWedge ProWedge H.O. Wedge MicroSub Enclosed Subwoofers|Marine Loudspeakers Marine Subwoofers and Marine Enclosed Loudspeakers|Home Subwoofers: Dominion E-Sub Fathom and Gotham